src/os/bsd/vm/osThread_bsd.cpp

rev 8802 : G1 performance improvements: card batching, joining, sorting, prefetching and write barrier fence elision and simplification based on a global syncrhonization using handshakes piggybacking on thread-local safepoints.

*** 49,53 ****
--- 49,78 ----
  }
  
  void OSThread::pd_destroy() {
    delete _startThread_lock;
  }
+ 
+ bool OSThread::is_online() {
+ #ifdef __APPLE__
+   mach_msg_type_number_t thread_info_count = THREAD_BASIC_INFO_COUNT;
+   thread_basic_info_data_t thread_info_data;
+ 
+   kern_return_t kr = thread_info(
+                                  _thread_id,
+                                  THREAD_BASIC_INFO,
+                                  reinterpret_cast<thread_info_t>(&thread_info_data),
+                                  &thread_info_count);
+   if (kr != KERN_SUCCESS) {
+     return false;
+   }
+ 
+   if (thread_info_data.run_state != TH_STATE_RUNNING) return false;
+ 
+   const bool swapped = (thread_info_data.flags & TH_FLAGS_SWAPPED);
+   const bool idle = (thread_info_data.flags & TH_FLAGS_IDLE);
+ 
+   return !swapped && !idle;
+ #else
+   return true;
+ #endif
+ }